lmb: nios2: Add arch_lmb_reserve()

Add arch_lmb_reserve() implemented using arch_lmb_reserve_generic().
It is rather likely this architecture also needs to cover U-Boot with
LMB before booting Linux.

Signed-off-by: Marek Vasut <[email protected]>
Cc: Simon Goldschmidt <[email protected]>
Cc: Thomas Chou <[email protected]>
Cc: Tom Rini <[email protected]>

1 files changed, 16 insertions, 0 deletions

diff --git a/arch/nios2/lib/bootm.c b/arch/nios2/lib/bootm.c
index 50374671515..3cb59bd9777 100644
--- a/arch/nios2/lib/bootm.c
+++ b/arch/nios2/lib/bootm.c
@@ -10,6 +10,9 @@
 #include <image.h>
 #include <irq_func.h>
 #include <log.h>
+#include <asm/global_data.h>
+
+DECLARE_GLOBAL_DATA_PTR;
 
 #define NIOS_MAGIC 0x534f494e /* enable command line and initrd passing */
 
@@ -60,3 +63,16 @@ int do_bootm_linux(int flag, int argc, char *const argv[],
 
 	return 1;
 }
+
+static ulong get_sp(void)
+{
+	ulong ret;
+
+	asm("mov %0, sp" : "=r"(ret) : );
+	return ret;
+}
+
+void arch_lmb_reserve(struct lmb *lmb)
+{
+	arch_lmb_reserve_generic(lmb, get_sp(), gd->ram_top, 4096);
+}